#include <stdio.h>
#define EOL 10
atoi(s) char s[];{
	int i,n,sign;
	for (i=0;
		(s[i] == ' ') | (s[i] == EOL) | (s[i] == '\t');
		++i) ;
	sign = 1;
	switch(s[i]){
	case '-': sign = -1; /* and fall through */
	case '+': ++i;
		break;
	}
	for(n = 0;
		isdigit(s[i]);
		++i)
		n = 10 * n + s[i] - '0';
	return (sign * n);
}
